Book binding machine



FIG. 1 is a top plan view of a book binding machine showing our new design.

FIG. 2 is a front elevational view thereof.

FIG. 3 is a side elevational view from the right of FIG. 2; the opposite side is similar.

FIG. 4 is a rear elevational view thereof.

FIG. 5 is a fragmentary cross-sectional view taken substantially along the line 5--5 of FIG. 1.

FIG. 6 is a bottom plan view. 

The ornamental design for a book binding machine, as shown and described. 